0 wt% 2.5 wt% 5 wt% -10 -20 -30 -9000 -6000 -3000 0 3000 6000 9000 H (Oe) Key words: Mg-Mn-Mg ferrite, bismuth oxide, liquid phase sintering, relative density, Rietveld reﬁnement, magnetic properties (Received October 26, 2017; accepted April 10, 2018; published online April 25, 2018) M (emu/g) The Effects of Bismuth Oxide on Microstructures and Magnetic Properties of Mn-Mg-Al 4079 Ferrites INTRODUCTION sintered bodies with high relative densities. Vana- 23–25 26–29 dium oxide and bismuth oxide have been Mg-Mn ferrites are technologically important in successfully tested to liquid phase sinter for the microwave devices such as circulators, gyrators, spinel ferrites to highly densiﬁed sintered bodies. phase shifters and isolators owing to their good In this paper, the effects of bismuth oxide on magnetic properties, high dc-resistivity, low eddy 1,2 microstructure of Mg-Mn-Al ferrites were investi- current loss and low dielectric loss. Basic compo- gated. Two different amounts of bismuth oxide sition of Mg Mn Fe O among different possible 0.9 0.1 2 4 compositions of Mg-Mn ferrite has a minimum spin (2.5 wt.% and 5 wt.%) were added as sintering canting, which is a good choice for relevant appli- additives. Sintering behaviors of the Mg-Mn-Al cations. Moreover, low
Journal of Electronic Materials – Springer Journals
Published: Apr 25, 2018
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